A
horse that trots. More specifically, a horse that has been bred and trained as a trotting
harness racer.
A
trotter moves its legs diagonally: right foreleg and left hindleg hit the ground together, then left foreleg and right hindleg hit the ground together. In a "
gaited" horse, this is done smoothly and efficiently, with at least one leg supporting the horse's body at all times. Trotting is a balanced
gait that comes naturally to horses, just as humans swing their arms opposite to their legs when walking or running.